Jump to content

  •  

CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.

Photo

Light Pollution Map Showing Roads

  • Please log in to reply
18 replies to this topic

#1 mountain monk

mountain monk

    Mercury-Atlas

  • *****
  • topic starter
  • Posts: 2872
  • Joined: 06 Nov 2009
  • Loc: Grand Teton National Park

Posted 19 March 2019 - 04:49 PM

What's the current best light pollution map showing roads. My old ones no longer seem to be working. Thanks for the help in advance.

Dark skies.

Jack

#2 bobito

bobito

    Apollo

  • *****
  • Posts: 1452
  • Joined: 15 Aug 2014
  • Loc: Litchfield County, CT

Posted 19 March 2019 - 04:53 PM

This is my goto:  https://www.lightpol...ers=B0FFFFTFFFF


  • CCD-Freak, BFaucett and Dougeo like this

#3 Astrojensen

Astrojensen

    Voyager 1

  • *****
  • Posts: 11527
  • Joined: 05 Oct 2008
  • Loc: Bornholm, Denmark

Posted 19 March 2019 - 04:53 PM

https://www.lightpollutionmap.info

 

EDIT: Beaten to it by mere seconds.

 

 

Clear skies!

Thomas, Denmark


Edited by Astrojensen, 19 March 2019 - 04:55 PM.

  • clearwaterdave and BFaucett like this

#4 Starman47

Starman47

    Viking 1

  • -----
  • Posts: 528
  • Joined: 10 Jun 2018
  • Loc: Tennessee

Posted 19 March 2019 - 04:58 PM

My personal favorite is light pollution map (see above for link). 



#5 csa/montana

csa/montana

    Den Mama & Gold Star Award Winner

  • *****
  • Moderators
  • Posts: 99453
  • Joined: 14 May 2005
  • Loc: montana

Posted 19 March 2019 - 06:01 PM

Nice link!  The SQM coincides with what I get on mine at my location.



#6 mountain monk

mountain monk

    Mercury-Atlas

  • *****
  • topic starter
  • Posts: 2872
  • Joined: 06 Nov 2009
  • Loc: Grand Teton National Park

Posted 19 March 2019 - 06:18 PM

Thanks, gang! Just what I was looking for.

Questions; Looking at the legend it appears that we have no black sky zones in the U.S., only gray (but not to complain!). However, if I click on the sky meter layer and then click on my favorite viewing sites along the southwest Montana/Idaho border, I get 21.99 and even 22.00 responses. An anomaly? Explanations? In the old days we used to get 22.00 readings at the north end of Jackson Hole--the local astronomy club had multiple meters--but, alas, no more.

Thanks again.

Dark skies.

Jack

#7 krneki

krneki

    Vostok 1

  • -----
  • Posts: 171
  • Joined: 24 Dec 2005
  • Loc: sLOVEnia (45.5° N)

Posted 20 March 2019 - 06:20 AM

It might look grey due to layers' opacity being set to 40% by default. if you set it to 100% then you won't see the base map, but you will see how the layer really looks like (black areas should be visible then).



#8 mountain monk

mountain monk

    Mercury-Atlas

  • *****
  • topic starter
  • Posts: 2872
  • Joined: 06 Nov 2009
  • Loc: Grand Teton National Park

Posted 20 March 2019 - 08:46 AM

Thank you very much. I'll try that.

Dark skies.

Jack

#9 Dougeo

Dougeo

    Mariner 2

  • *****
  • Posts: 249
  • Joined: 21 Dec 2017
  • Loc: Apache Junction, AZ

Posted 20 March 2019 - 10:29 AM

Great link ,thanks so much for sharing it! smile.gif

 

Doug



#10 Starman1

Starman1

    Vendor (EyepiecesEtc.com)

  • *****
  • Vendors
  • Posts: 40829
  • Joined: 23 Jun 2003
  • Loc: Los Angeles

Posted 20 March 2019 - 04:26 PM

The VIIRS maps, when 2016, 2017, and 2018 are quickly selected, show the growth of light in the last couple years.

The 2015 Atlas, though, shows the truth about the general light pollution in an area, while the VIIRS maps show local areas of light pollution,

even individual farms are seen at maximum expansion.


Edited by Starman1, 20 March 2019 - 05:05 PM.

  • stargazer193857 likes this

#11 Mike91977

Mike91977

    Sputnik

  • -----
  • Posts: 43
  • Joined: 07 Dec 2018

Posted 20 March 2019 - 04:39 PM

Here’s some similar light pollution maps you just have to adjust settings as desired.

https://www.goodtostargaze.com/#

https://darksitefind...35.964/-116.453

https://www.astrospheric.com

#12 tmiddendorf

tmiddendorf

    Sputnik

  • *****
  • Posts: 34
  • Joined: 31 May 2015

Posted 21 March 2019 - 08:36 AM

This is an awesome resource. Thanks for posting it.



#13 mountain monk

mountain monk

    Mercury-Atlas

  • *****
  • topic starter
  • Posts: 2872
  • Joined: 06 Nov 2009
  • Loc: Grand Teton National Park

Posted 22 March 2019 - 05:25 PM

After playing with it, I'm very impressed. And the site I mentioned--the Gravelly Range west of West Yellowstone, Montana--remains a black sky/ Bortle 1 zone. A great resource indeed.

Dark skies.

Jack

Edited by mountain monk, 22 March 2019 - 05:29 PM.


#14 stargazer193857

stargazer193857

    Fly Me to the Moon

  • *****
  • Posts: 7108
  • Joined: 01 Dec 2013
  • Loc: Southern Idaho

Posted 24 March 2019 - 07:51 PM

https://darksitefind...4/27.53/-101.78

#15 stargazer193857

stargazer193857

    Fly Me to the Moon

  • *****
  • Posts: 7108
  • Joined: 01 Dec 2013
  • Loc: Southern Idaho

Posted 24 March 2019 - 08:08 PM

The VIIRS maps, when 2016, 2017, and 2018 are quickly selected, show the growth of light in the last couple years.
The 2015 Atlas, though, shows the truth about the general light pollution in an area, while the VIIRS maps show local areas of light pollution,
even individual farms are seen at maximum expansion.


Link?

#16 Starman1

Starman1

    Vendor (EyepiecesEtc.com)

  • *****
  • Vendors
  • Posts: 40829
  • Joined: 23 Jun 2003
  • Loc: Los Angeles

Posted 24 March 2019 - 09:21 PM

see post 2 and post 3 in this thread.

#17 stargazer193857

stargazer193857

    Fly Me to the Moon

  • *****
  • Posts: 7108
  • Joined: 01 Dec 2013
  • Loc: Southern Idaho

Posted 25 March 2019 - 03:20 AM

Over the years, the red zone in my city has grown dramatically.

#18 Migwan

Migwan

    Apollo

  • *****
  • Posts: 1025
  • Joined: 24 Jul 2017
  • Loc: Meeechigan

Posted 25 March 2019 - 09:01 AM

The VIIRS maps, when 2016, 2017, and 2018 are quickly selected, show the growth of light in the last couple years.

The 2015 Atlas, though, shows the truth about the general light pollution in an area, while the VIIRS maps show local areas of light pollution,

even individual farms are seen at maximum expansion.

Window at opening of site says; "Direct annual comparisons are to be avoided as there are too many factors involved. If you want an analysis of radiance (VIIRS/DMSP) changes over a period of time, then please use the Lighttrends application." 

 

I bring this up because clicking from one year to the next pretty much destroys my 2 dark sites which is something I haven't noticed.   Regretfully, after 2 tries over a period of 6 days I haven't been able to get the Lighttrends site to demo one year to the next.  That said, I am slightly technology challenged, so I might be missing something.  jd

 

Edit. By "while the VIIRS maps show local areas of light pollution, even individual farms are seen at maximum expansion."  were you referring to Lighttrends link?   There are 5 residences about 3 miles of my former dark site of which only 2 currently have working outdoor lighting.  Those two show up on Lighttrends but I can't find them on the main site without the overlay on hybrid and zooming in for a rather daytime visual of them.  Just wondering if I might have missed something on the main site. 


Edited by Migwan, 25 March 2019 - 10:14 AM.


#19 Migwan

Migwan

    Apollo

  • *****
  • Posts: 1025
  • Joined: 24 Jul 2017
  • Loc: Meeechigan

Posted 25 March 2019 - 10:12 AM

Having the map overlays actually work on lightpollutionmap site is awesome.  By clicking Hybrid under Bing Base Layers I have been able to locate new open dark site (no horizon killing trees) that is 15 minutes closer to home and almost 15 miles further from any towns/cities.  Have not checked it in person yet, but the possibility is intriguing. 

 

Problem is, I am not sure of the accuracy of either this site or my own Bortle evaluation.  My favorite dark site to date is well into National Forrest and I have evaluated it as being Bortle 2.  I can just see m33 directly, stars just past 7.5 (according to Stellarium) and clouds are dark to the horizon (when there is no snow cover).  Zodiac light can be seen, but I am not yet sure how to evaluate them.

 

The aforementioned site gives my dark site a Bortle 3 while darksitefinder gives it a Bortle 2, the latter agreeing more to my assessment.    At home it is more forgiving, giving me a Bortle 4 where I my evaluation is a Bortle 5 when viewing from SW to NE and Bortle 6 to as bad as 8  from E to S.  No way is it Bortle 4, even as subjective as that evaluation can be.    I don't have an SQM meter, so no help there.

 

Still, this is an awesome site and I am so glad I caught this thread.  Thanks.  jd

 

Edit;  Well, regarding the lightpollutionmap, perhaps it is not wrong about my favorite dark site.  I hadn't checked checked darksitefinder in a number of months and as such missed a change in color there, form dark blue to blue.   Ouch.  


Edited by Migwan, 26 March 2019 - 07:33 AM.



CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.


Recent Topics






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics